20 May 2014 Quasidistributed fiber Bragg grating sensor network based on self-heterodyne detection technique
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Abstract
A serial time-division multiplexing optical fiber sensing network with a large multiplexing capacity, which is based on identical ultraweak fiber Bragg gratings (FBGs) and self-heterodyne detection technique, is proposed. An experimental system, which has 10 identical ultraweak FBGs with the same Bragg wavelength of 1550 nm, reflectivity of −36  dB , and bandwidth of 0.1 nm, is set up to investigate the performance of the proposed scheme. The spectra of 10 ultraweak FBGs are resolved with a high accuracy, and the wavelength–temperature sensitivity and temperature resolution of the system are 10.5  pmC , 0.09°C, respectively. A self-heterodyne detection technique is adopted to increase the sensitivity of the receiver, which makes it possible to multiplex over 1000 FBGs along a single optical fiber. Theoretical analyses demonstrate that this sensing scheme can effectively increase the multiplexing capacity and measurement accuracy.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Sheqiang Zhang, Ming Chen, Qian He, Wei Chen, Hui Chen, Haiou Li, "Quasidistributed fiber Bragg grating sensor network based on self-heterodyne detection technique," Optical Engineering 53(5), 057107 (20 May 2014). https://doi.org/10.1117/1.OE.53.5.057107 . Submission:
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